ABAP Select data from SAP table TDS_HEADCOMV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TDS_HEADCOMV table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to TDS_HEADCOMV. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the TDS_HEADCOMV table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_TDS_HEADCOMV TYPE STANDARD TABLE OF TDS_HEADCOMV,
      WA_TDS_HEADCOMV TYPE TDS_HEADCOMV,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <TDS_HEADCOMV> TYPE TDS_HEADCOMV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TDS_HEADCOMV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TDS_HEADCOMV
  INTO TABLE IT_TDS_HEADCOMV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDS_HEADCOMV
*  INTO TABLE @DATA(IT_TDS_HEADCOMV2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_TDS_HEADCOMV INDEX 1 INTO DATA(WA_TDS_HEADCOMV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TDS_HEADCOMV ASSIGNING <TDS_HEADCOMV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDS_HEADCOMV>-AUART = 1.
<TDS_HEADCOMV>-AUART_T = 1.
<TDS_HEADCOMV>-VKORG = 1.
<TDS_HEADCOMV>-VTWEG = 1.
<TDS_HEADCOMV>-SPART = 1.

ENDLOOP.

LOOP AT IT_TDS_HEADCOMV INTO WA_TDS_HEADCOMV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDS_HEADCOMV-VKBUR, sy-vline,
  WA_TDS_HEADCOMV-VKBUR_T, sy-vline,
  WA_TDS_HEADCOMV-VKGRP, sy-vline,
  WA_TDS_HEADCOMV-VKGRP_T, sy-vline,
  WA_TDS_HEADCOMV-VBELN, sy-vline,
  WA_TDS_HEADCOMV-KUNAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TDS_HEADCOMV you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_TDS_HEADCOMV TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_TDS_HEADCOMV INTO WA_TDS_HEADCOMV.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-AUART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-KUNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-KUNAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNWE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-KUNWE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-KUNWE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-VOLEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EXCRT, internal->external for field KURSK
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-KURSK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-KURSK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field CPD_LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TDS_HEADCOMV-CPD_LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_HEADCOMV-CPD_LANGUAGE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TDS_HEADCOMV_STR, 
AUART TYPE STRING,
AUART_T TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
VKBUR TYPE STRING,
VKBUR_T TYPE STRING,
VKGRP TYPE STRING,
VKGRP_T TYPE STRING,
VBELN TYPE STRING,
KUNAG TYPE STRING,
KUNWE TYPE STRING,
BSTKD TYPE STRING,
BSTDK TYPE STRING,
KPRGBZ TYPE STRING,
KETDAT TYPE STRING,
DWERK TYPE STRING,
VTBER_T TYPE STRING,
KUNAG_T TYPE STRING,
KUNWE_T TYPE STRING,
DWERK_T TYPE STRING,
GEWEI TYPE STRING,
VOLEH TYPE STRING,
BTGEW TYPE STRING,
VOLUM TYPE STRING,
AUGRU TYPE STRING,
LIFSK TYPE STRING,
FAKSK TYPE STRING,
PRSDT TYPE STRING,
WAERK TYPE STRING,
KURSK TYPE STRING,
INCO1 TYPE STRING,
INCO2 TYPE STRING,
FKDAT TYPE STRING,
ZTERM TYPE STRING,
ZTERM_T TYPE STRING,
AUTLF TYPE STRING,
ENDBK TYPE STRING,
NETWR TYPE STRING,
AUDAT TYPE STRING,
ANGDT TYPE STRING,
BNDDT TYPE STRING,
GUEBG TYPE STRING,
GUEEN TYPE STRING,
VSBED TYPE STRING,
ZLSCH TYPE STRING,
ZLSCH_T TYPE STRING,
CPD_NAME TYPE STRING,
CPD_STREET TYPE STRING,
CPD_HNUM TYPE STRING,
CPD_PCODE TYPE STRING,
CPD_CITY TYPE STRING,
CPD_COUNTRY TYPE STRING,
CPD_LANGUAGE TYPE STRING,
TRVOG TYPE STRING,
DELCO TYPE STRING,
VBEGDAT TYPE STRING,
VENDDAT TYPE STRING,
VBEGREG TYPE STRING,
VENDREG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDS_HEADCOMV_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_TDS_HEADCOMV_STR-AUART sy-vline 
WA_TDS_HEADCOMV_STR-AUART_T sy-vline 
WA_TDS_HEADCOMV_STR-VKORG sy-vline 
WA_TDS_HEADCOMV_STR-VTWEG sy-vline 
WA_TDS_HEADCOMV_STR-SPART sy-vline 
WA_TDS_HEADCOMV_STR-VKBUR sy-vline 
WA_TDS_HEADCOMV_STR-VKBUR_T sy-vline 
WA_TDS_HEADCOMV_STR-VKGRP sy-vline 
WA_TDS_HEADCOMV_STR-VKGRP_T sy-vline 
WA_TDS_HEADCOMV_STR-VBELN sy-vline 
WA_TDS_HEADCOMV_STR-KUNAG sy-vline 
WA_TDS_HEADCOMV_STR-KUNWE sy-vline 
WA_TDS_HEADCOMV_STR-BSTKD sy-vline 
WA_TDS_HEADCOMV_STR-BSTDK sy-vline 
WA_TDS_HEADCOMV_STR-KPRGBZ sy-vline 
WA_TDS_HEADCOMV_STR-KETDAT sy-vline 
WA_TDS_HEADCOMV_STR-DWERK sy-vline 
WA_TDS_HEADCOMV_STR-VTBER_T sy-vline 
WA_TDS_HEADCOMV_STR-KUNAG_T sy-vline 
WA_TDS_HEADCOMV_STR-KUNWE_T sy-vline 
WA_TDS_HEADCOMV_STR-DWERK_T sy-vline 
WA_TDS_HEADCOMV_STR-GEWEI sy-vline 
WA_TDS_HEADCOMV_STR-VOLEH sy-vline 
WA_TDS_HEADCOMV_STR-BTGEW sy-vline 
WA_TDS_HEADCOMV_STR-VOLUM sy-vline 
WA_TDS_HEADCOMV_STR-AUGRU sy-vline 
WA_TDS_HEADCOMV_STR-LIFSK sy-vline 
WA_TDS_HEADCOMV_STR-FAKSK sy-vline 
WA_TDS_HEADCOMV_STR-PRSDT sy-vline 
WA_TDS_HEADCOMV_STR-WAERK sy-vline 
WA_TDS_HEADCOMV_STR-KURSK sy-vline 
WA_TDS_HEADCOMV_STR-INCO1 sy-vline 
WA_TDS_HEADCOMV_STR-INCO2 sy-vline 
WA_TDS_HEADCOMV_STR-FKDAT sy-vline 
WA_TDS_HEADCOMV_STR-ZTERM sy-vline 
WA_TDS_HEADCOMV_STR-ZTERM_T sy-vline 
WA_TDS_HEADCOMV_STR-AUTLF sy-vline 
WA_TDS_HEADCOMV_STR-ENDBK sy-vline 
WA_TDS_HEADCOMV_STR-NETWR sy-vline 
WA_TDS_HEADCOMV_STR-AUDAT sy-vline 
WA_TDS_HEADCOMV_STR-ANGDT sy-vline 
WA_TDS_HEADCOMV_STR-BNDDT sy-vline 
WA_TDS_HEADCOMV_STR-GUEBG sy-vline 
WA_TDS_HEADCOMV_STR-GUEEN sy-vline 
WA_TDS_HEADCOMV_STR-VSBED sy-vline 
WA_TDS_HEADCOMV_STR-ZLSCH sy-vline 
WA_TDS_HEADCOMV_STR-ZLSCH_T sy-vline 
WA_TDS_HEADCOMV_STR-CPD_NAME sy-vline 
WA_TDS_HEADCOMV_STR-CPD_STREET sy-vline 
WA_TDS_HEADCOMV_STR-CPD_HNUM sy-vline 
WA_TDS_HEADCOMV_STR-CPD_PCODE sy-vline 
WA_TDS_HEADCOMV_STR-CPD_CITY sy-vline 
WA_TDS_HEADCOMV_STR-CPD_COUNTRY sy-vline 
WA_TDS_HEADCOMV_STR-CPD_LANGUAGE sy-vline 
WA_TDS_HEADCOMV_STR-TRVOG sy-vline 
WA_TDS_HEADCOMV_STR-DELCO sy-vline 
WA_TDS_HEADCOMV_STR-VBEGDAT sy-vline 
WA_TDS_HEADCOMV_STR-VENDDAT sy-vline 
WA_TDS_HEADCOMV_STR-VBEGREG sy-vline 
WA_TDS_HEADCOMV_STR-VENDREG sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.